monitor console command implemented.

Source/devtools/front_end/RuntimeModel.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 248 matching lines @@
         function receivedPropertyNames(propertyNames)
         {
             RuntimeAgent.releaseObjectGroup("completion");
             if (!propertyNames) {
                 completionsReadyCallback([]);
                 return;
             }
             var includeCommandLineAPI = (!dotNotation && !bracketNotation);
             if (includeCommandLineAPI) {
                 const commandLineAPI = ["dir", "dirxml", "keys", "values", "profile", "profileEnd", "monitorEvents", "unmonitorEvents", "inspect", "copy", "clear",
-                    "getEventListeners", "table", "$", "$$", "$x"];
+                    "getEventListeners", "debug", "undebug", "monitor", "unmonitor", "table", "$", "$$", "$x"];
                 for (var i = 0; i < commandLineAPI.length; ++i)
                     propertyNames[commandLineAPI[i]] = true;
             }
             this._reportCompletions(completionsReadyCallback, dotNotation, bracketNotation, expressionString, prefix, Object.keys(propertyNames));
         }
     },
 
     /**
      * @param {function(!Array.<string>, number=)} completionsReadyCallback
      * @param {boolean} dotNotation
@@ skipping 168 matching lines @@
         if (subtitle) {
             if (!name)
                 return subtitle;
             return name + "( " + subtitle + " )";
         }
         return "<iframe>";
     },
 
     __proto__: WebInspector.Object.prototype
 }